I am making a variation of this, they go for over 200 so I thought I would give it a go. The 10" was the smallest big pulley they had at the hardware store so I am going with it. I already have a few smaller Pullies. The advantage to this type is that the machine will still tilt back and it bolts into the existing holes. Hopefully it will work....
http://i.ebayimg.com/00/s/NDgwWDY0MA==/z/X6UAAOxy7RBRYjjI/$T2eC16h,!yEE9s5jHPtcBRYjjIFHr!~~60_35.JPG
Some tips found here: http://makezine.com/2014/01/30/bandsaw-speed-changer-reducer/